1 /* Which POSIX version to conform to, for utilities.
2
3 Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
4
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2, or (at your option)
8 any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License along
16 with this program; if not, write to the Free Software Foundation,
17 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
18
19 /* Written by Paul Eggert. */
20
21 #if HAVE_CONFIG_H
22 # include <config.h>
23 #endif
24
25 #include "posixver.h"
26
27 #include <limits.h>
28 #include <stdlib.h>
29
30 #if HAVE_UNISTD_H
31 # include <unistd.h>
32 #endif
33 #ifndef _POSIX2_VERSION
34 # define _POSIX2_VERSION 0
35 #endif
36
37 #ifndef DEFAULT_POSIX2_VERSION
38 # define DEFAULT_POSIX2_VERSION _POSIX2_VERSION
39 #endif
40
41 /* The POSIX version that utilities should conform to. The default is
42 specified by the system. */
43
44 int
posix2_version(void)45 posix2_version (void)
46 {
47 long int v = DEFAULT_POSIX2_VERSION;
48 char const *s = getenv ("_POSIX2_VERSION");
49
50 if (s && *s)
51 {
52 char *e;
53 long int i = strtol (s, &e, 10);
54 if (! *e)
55 v = i;
56 }
57
58 return v < INT_MIN ? INT_MIN : v < INT_MAX ? v : INT_MAX;
59 }
60